巷深缘浅

It combines contrasting concepts of depth ('深 deep alley') and shallowness ('缘浅 slight destiny'). The term could express a sense of life events happening within hidden alleyways with limited but meaningful encounters or the idea that deeper settings sometimes conceal superficial relations. This indicates the complex feelings of a deep context in which people's relationships are not very deep or lasting, evoking an emotion similar to regret.